Home / 20,290.45-30,435.72-7,139.83

Finding the Fourth Proportional to 20,290.45, 30,435.72 and 7,139.83

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Solution

The fourth proportional to 20,290.45, 30,435.72 and 7,139.83 is: 10,709.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,290.45 : 30,435.72 = 7,139.83 : x
  2. Step 2: Convert to fraction form
    20,290.45/30,435.72 = 7,139.83/x
  3. Step 3: Cross multiply
    20,290.45x = 30,435.72 × 7,139.83
  4. Step 4: Simplify right side
    20,290.45x = 217,305,866.73
  5. Step 5: Solve for x
    x = 217,305,866.73/20,290.45
  6. Step 6: Final answer
    x = 10,709.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.